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3 years ago

Select me correct answer.

Mathematics

2 answers:

xz_007 [3.2K]3 years ago

6 0

The first one. The second looks like (p-6)+2. The third looks like (2-p)6. And the fourth looks like 6+ (2+p)

aalyn [17]3 years ago

5 0

2 - (p + 6)

A. two minus the sum(addition) of p and six(so p and 6 are added together)

2 - (p + 6)

B. two added to the difference(subtraction) of p and six(p an 6 are subtracted together)

2 + (p - 6)

C. the difference of two and p times(multiplication) six

6(2 - p)

D. the sum of two and p added to six

(2 + p) + 6

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Suppose a student's score on a standardize test to be a continuous random variable whose distribution follows the Normal curve.

blsea [12.9K]

Answer:

a) Percentage of students scored below 300 is 1.79%.

b) Score puts someone in the 90th percentile is 638.

Step-by-step explanation:

Given : Suppose a student's score on a standardize test to be a continuous random variable whose distribution follows the Normal curve.

(a) If the average test score is 510 with a standard deviation of 100 points.

To find : What percentage of students scored below 300 ?

Solution :

Mean $\mu=510$ ,

Standard deviation $\sigma=100$

Sample mean $x=300$

Percentage of students scored below 300 is given by,

$P(Z\leq \frac{x-\mu}{\sigma})\times 100$

$=P(Z\leq \frac{300-510}{100})\times 100$

$=P(Z\leq \frac{-210}{100})\times 100$

$=P(Z\leq-2.1)\times 100$

$=0.0179\times 100$

$=1.79\%$

Percentage of students scored below 300 is 1.79%.

(b) What score puts someone in the 90th percentile?

90th percentile is such that,

$P(x\leq t)=0.90$

Now, $P(\frac{x-\mu}{\sigma} < \frac{t-\mu}{\sigma})=0.90$

$P(Z< \frac{t-\mu}{\sigma})=0.90$

$\frac{t-\mu}{\sigma}=1.28$

$\frac{t-510}{100}=1.28$

$t-510=128$

$t=128+510$

$t=638$

Score puts someone in the 90th percentile is 638.

5 0

3 years ago

2x + 3y = 17 5x + 6y = 32 Usibg method if elimination

lions [1.4K]

Answer:

Solution (-2, 7)

Step-by-step explanation:

2x + 3y = 17 (1)

5x + 6y = 32 (2)

Using elimination method

Multiply (-2) to the equation (1)

-4x - 6y = -34

Now you have 2 new equations

-4x - 6y = -34

5x + 6y = 32

----------------------------Add

x = -2

Substitute x = -2 into 2x + 3y = 17

2(-2) + 3y = 17

- 4 + 3y = 17

3y = 21

y = 7

Solution (-2, 7)

6 0

2 years ago

Need help seriously

Dima020 [189]

It’s not hard bro you gotta lean probability it’s really easy

5 0

3 years ago

Read 2 more answers

Find the values of x y and z

andrey2020 [161]

9514 1404 393

Answer:

x = 18√2
y = 18√3
z = 36

Step-by-step explanation:

These "special" right triangles have side length ratios that it is useful to remember.

45°-45°-90° triangle

Sides have the ratios 1 : 1 : √2. That is, x is √2 times as long as the side length shown as 18.

x = 18√2

30°-60°-90° triangle

Shortest to longest, sides have the ratios ...

1 : √3 : 2

That is, y is √3 times the length of the side marked 18, and z is 2 times the length of the side marked 18.

y = 18√3

z = 2·18 = 36

4 0

3 years ago

What expression is equivalent to -7(5a)

Aneli [31]

Answer:

-35a

Step-by-step explanation:

Here, you just distribute: -7 * 5a

= -35a

7 0

3 years ago